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I have recently started a recovery on my 5-drive RAID in my file-server, and it says it'll take 691+ minutes to complete. I was wondering what would happen to the process if the machine lost power - say in a blackout? Would I need to restart the recovery process again? Would I lose the whole RAID of data?

Also, what would happen if I was in the process of growing the RAID and the power went out?

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A normal shutdown is well managed by mdadm, but a blackout (as always) may be tragic.

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    If I shut it down (or more likely, my wife decides to shut it down) would it mean I need to restart the recovery/growth of the array, or would the next boot of the machine resume it from where it left off?
    – jsnfwlr
    Jul 28, 2010 at 15:48
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    The recovery/growth will start all over again.
    – Jasper
    Jul 28, 2010 at 18:04
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    I did a shutdown and restart while a RAID-5 recovery was running and it picked up where it left off. Kernel v6.5.5. Oct 4, 2023 at 21:32

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